Is struct A { int a[2] = {1, 2}; }; legal as per C++11?

Question

The following code is accepted by clang 3.4

struct A
{
    int a[2] = {1, 2};
};

However, vc++ 2014 CTP rejects it with an error message:

error C2536: 'A::A::a': cannot specify explicit initializer for arrays

Which compiler is correct?

Answer 1

Yes, It is legal but VC++ does not support this feature. It is the uniform initialization of an in-class member initialization.

Of course the = sign is optional and your code is the same as the following code:

struct A
{
    int a[2] {1, 2};
};